# Summary chapter 7: wordformulas 7.1 en 7.2

H7 Wordformulas
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Slide 1: Slide
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This lesson contains 13 slides, with text slides.

Lesson duration is: 30 min

## Items in this lesson

H7 Wordformulas

#### Slide 1 -Slide

7.1 From description to wordformulas
7.2 Graphs from formulas
7.3 Linear formules
7.4 Making formulas for graphs
7.5 Comparing graphs

#### Slide 2 -Slide

To make a wordformula from the setting on the left you must find regularity!
You can see at each table there are 4 chairs. So if you know the number of tables you have to multiply by 4. But, be aware of the fixed amount! At the end there are 2 more chairs
Number of tables times  4 plus 2 is the  number of chairs
7.1

#### Slide 3 -Slide

And again: At this table always 6 chairs. So if you know the number of chairs you have to multiply with 6. But!!! At the end there are 2 more chairs so you must add 2 as well.
The number of tables times 6 plus 2 is the number of chairs.
Formula:  number of tables x 6 + 2 = number of chairs
Fixed amount and 'per' number

#### Slide 4 -Slide

How to make a wordformula from the setting on the left you must find regularity!
You can see at each table there are 4 chairs. So if you know the number of tables you have to multiply by 4. But, be aware of the fixed amount! At the end there are 2 more chairs
Number of tables times  4 plus 2 is the  number of chairs

#### Slide 5 -Slide

It doesn't  matter how many cupcakes she makes, the 12 euros is just once. The 12 euros is what we call the fixed amount
Profit =  .... - number of cupcakes x .....

#### Slide 6 -Slide

It doesn't  matter how many cupcakes she makes, the 12 euros is just once. The 12 euros is what we call the fixed amount
Profit =  12 - number of cupcakes x 0,80

#### Slide 7 -Slide

7.2
Graphs from formulas: method-theory

#### Slide 8 -Slide

7.2
Graphs from formulas: method-theory

#### Slide 9 -Slide

In this formula time is in hours and the distance in km.
Calculate the distance in case you've cycled for 3 hours.

15 x time =distance
7.2

#### Slide 10 -Slide

In this formula time is in hours and the distance in km.
Calculate the distance in case you've cycled for 3 hours.

15 x time =distance
15 x 3 = distance
45 = distance
so 45 km cycling
7.2

#### Slide 11 -Slide

Formula: 15 x time =distance
Table:

7.2
time
0
1
2
3
distance
0
15
30
45

#### Slide 12 -Slide

Formula: 15 x time =distance
Table:

Graph:
7.2
Graphs from formulas: theory
time
0
1
2
3
distance
0
15
30
45